Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN







1998 GMC Safari - heater/ac actuator question


  Email This Post



lablady
Novice

Dec 4, 2006, 7:24 PM

Post #1 of 4 (3098 views)
Shortcut
     1998 GMC Safari - heater/ac actuator question  

We just bought this van and have discovered that the air/heat only comes out the front vents and not to defrost or underneath the dash. We cannot choose where the flow of air (hot/cold) is directed. The switch that controls the blend of air (hot/cold) works fine, the speed switch to blow the air works as well, and the on/off part of the selector switch works fine too. My husband did a little research with the auto parts' store clerk and the research shows that it's an electric actuator not a vacuum-powered actuator for this van. Could the problem be the selector switch or is the problem in the actual actuator? If it's the actuator, how can my husband get to it to replace it or test it?

Any help or insights would be greatly appreciated!

Thanks!! :)

lablady and husband


DanD
Veteran / Moderator


Dec 5, 2006, 7:29 AM

Post #2 of 4 (3090 views)
Shortcut
     Re: 1998 GMC Safari - heater/ac actuator question [In reply to]  

The mode control or air distribution on this vehicle is a vacuum operated system not an electrical one.
Most times when there is a vacuum supply problem from the engine as in the black tubing from the engine to the heater controls becomes cracked or broken the heater system would default to the defrost mode.
With you saying that yours is always in the vent mode, could be a number of different things causing this.
The mode door maybe stuck in one position from something falling into the defroster vent.
The mode control selector is not directing vacuum to the proper actuator. Possibly one of the vacuum lines from the selector switch to an actuator is leaking vacuum.
Or a bad actuator and it cannot move the mode door.
As for who is or isn’t doing what to whom is anyone’s guess.
I’ve just looked through the different test procedures and I don’t have one for this scenario.
So all I can suggest is to get under the dash and check for vacuum supply; that the mode switch actually switches vacuum delivery to the different lines and that the actuators are actually moving the different doors.
Here is a couple of diagrams that may help as in location of the different colors of lines and to whom there connected.
Dan.







Canadian "EH"






sailr
New User

May 11, 2012, 1:06 PM

Post #3 of 4 (1981 views)
Shortcut
     Re: 1998 GMC Safari - heater/ac actuator question [In reply to]  

Perhaps the Canadian model had the vacuum operation in 1998 but in the US, it is all electrical!


Hammer Time
Ultimate Carjunky / Moderator


May 11, 2012, 2:27 PM

Post #4 of 4 (1974 views)
Shortcut
     Re: 1998 GMC Safari - heater/ac actuator question [In reply to]  

After 6 years, nobody cares.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.





1998 GMC Safari - heater/ac actuator question


  Email This Post
 
 






Latest Forum Post
The front hub on my 2002 Isuzu Rodeo 4x4 doesn't look anything like the pictures...
So I have a 2003 Chevy Silverado and my exhaust manifold has broken bolts, which...
Most people know how it goes with a GMC pickup, van, hummer or various other veh...
Don't know where to begin cleanup of old car in a small farm shed. Mice, pigeon ...
Hey, I'm driving a 97 Gm 1ton with a 454, 158,000km. I went out to backup my tr...
Hello everyone, I have a 1991 Toyota Celica Turbo ...

Feed Button


Used Car Search
Used Car Price Ranges:
Under $5,000
$20,000
$35,000

$10,000
$25,000
$40,000
$15,000
$30,000
$45,000
Over $45,000
Search used Cars By Manufacturers:
Used Acura
Used Audi
Used BMW
Used Buick
Used Cadillac
Used Chevrolet
Used Chrysler
Used Dodge
Used FIAT
Used Ford
Used GMC

Used Honda
Used Hyundai
Used Infiniti
Used Jaguar
Used Jeep
Used Kia
Used Land Rover
Used Lexus
Used Lincoln
Used Mazda
Used Mercedes-Benz

Used MINI
Used Mitsubishi
Used Nissan
Used Porsche
Used Saab
Used Scion
Used Subaru
Used Suzuki
Used Toyota
Used Volkswagon
Used Volvo
2010 Honda Civic
$15,770
2004 Jeep
$8,991
2012 Mustang
$22,990
1997 Honda Cr-V
$4,490
2010 Toyota Prius
$17,496
2010 BMW 328
$26,980




Automotive Forum Categories
Automotive Repair
Auto Body Repair and Refinishing
AC Auto Repair Help Forum
Automotive Wiring and Electrical

Auto Insurance and Car Financing
Automotive World
Brake Systems
Car Stereo Repair Advice
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair

Steering and Suspension
Tricks of the Trade
General Discussions
Car Shows and Events
The Bargin Bin
Motor Vehicle Inspection
Car Care Tips
Traffic Ticket Help
Car Racing

Gasoline, Motor Oils, Concept Cars
Remote Control Cars and Vehicles
Truck Repair
Truck Repair Advice


Truck Engine Repair
Truck Suspension Repair
Motorcycle Repair
Motorcycle and ATV Repairs

Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Seat Repair
Car Forum Posts - Sitemap


Search for (options)